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Reason:
The Whether is coldest during early morning. The GAS density increases, but we pay by the Volume of Gas, Not the Density. So you end up getting more Gas (same volume with high density). This would last longer than usual gas. !

#4
Hmm I never thought of that, another trick that I use is Neutral. I drive an SUV and live in a hilly area so when I'm doing down hill I shift into neutral and just coast all the way down and then all the way up the other side. This really lowers your RPM's and you can also use it whenever you are coming to a stop. Note: I'm not sure if this is good or bad for your car so if somthing bad happens don't blame me but my SUV is just fine ^_^

But doing this I pull about an extra 3 or 4 miles per gallon, combined with going the speed limit and driving with my windows up.

#5
No offense, but I would appreciate a link to a legitimate study. Some tips like "fill up late at night" or "fill up only in the morning" may actually only save a couple dollars, and you should evaluate if the strategy is worth the extra time and effort it may cost you